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...there are TWO determinants happening in exhaust "tuning":
• SONIC (acoustive) velocity (1100 to 1700 fps) which is temperature dependent.
• MASS (gas slug) velocity (up to 300 fps) which is pipe cross-sectional area dependent.
...one is 'why' headers are sometimes wrapped to hold-in heat, and the other is 'why' headers use different diameters and lengths.
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